CN211317368U - Sensor detection circuit and electronic equipment - Google Patents

Abstract

The utility model discloses a sensor detection circuitry and electronic equipment, its sensor detection circuitry includes signal processing circuit, fault detection circuit and sensing signal input, sensing signal input connects signal processing circuit's input and fault detection circuit's sense terminal simultaneously, sensing signal input still is used for connecting at least one sensor output, fault detection circuit includes pull-up circuit and drop-down circuit, pull-up circuit establishes ties between sense terminal and first reference voltage input, drop-down circuit establishes ties between sense terminal and second reference voltage input. According to the embodiment of the utility model provides a, the voltage variation of sensor output can judge the quality of connection in the sensor under pull-up circuit and pull-down circuit's the on-off state in the fault detection circuit according to its signal processing circuit, and then realizes the fault detection after the module or complete machine are assembled into to the sensor.

Description

Sensor detection circuit and electronic equipment

Technical Field

The utility model relates to a measurement field, in particular to sensor detection circuitry and electronic equipment.

Background

The quality of the sensors of the wheatstone construction is currently checked by the sensor manufacturer before the sensors are assembled into modules. But often can't detect the quality of sensor in real time after the sensor assembles into the module or whole machine, seriously influence user's use experience. Therefore, it is necessary to provide a sensor detection circuit for detecting faults after the sensor is assembled into a module or a complete machine.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present invention provides a sensor detection circuit and an electronic device, which aims to solve the technical problem of how to perform fault detection after a sensor is assembled into a module or a complete machine.

In order to solve the technical problem, the utility model provides a sensor detection circuit, including signal processing circuit, fault detection circuit and sensing signal input end, sensing signal input end connects simultaneously signal processing circuit's input with fault detection circuit's sense terminal, sensing signal input end still is used for connecting at least one sensor output end, fault detection circuit includes pull-up circuit and drop-down circuit, pull-up circuit establishes ties between sense terminal and the first reference voltage input end, drop-down circuit establishes ties between sense terminal and the second reference voltage input end.

Optionally, the number of the sensing signal input ends is at least two, one side of each sensing signal input end is connected with one sensor output end, and a connection point between the detection end of the fault detection circuit and the input end of the signal processing circuit is connected with the other side of each sensing signal input end through a single-pole multi-throw switch.

Optionally, the number of the signal processing circuit, the number of the fault detection circuit and the number of the sensing signal input ends are respectively multiple, the number of the signal processing circuit, the number of the fault detection circuit and the number of the sensing signal input ends are arranged in a one-to-one correspondence manner, one side of each sensing signal input end is connected with one sensor output end, and the other side of each sensing signal input end is connected with the corresponding detection end of the fault detection circuit and the corresponding input end of the signal processing circuit.

Optionally, the number of the fault detection circuits and the number of the sensing signal input ends are multiple, the number of the signal processing circuits is at least one and less than the number of the sensing signal input ends, the fault detection circuits and the sensing signal input ends are arranged in a one-to-one correspondence manner, one side of each sensing signal input end is connected with one sensor output end, the other side of each sensing signal input end is connected with the corresponding detection end of the fault detection circuit, and the input end of at least one signal processing circuit is connected with the other side of at least two sensing signal input ends through a single-pole multi-throw switch.

Optionally, the number of the signal processing circuits and the number of the sensing signal input ends are respectively multiple, the number of the fault detection circuits is at least one and less than the number of the sensing signal input ends, the signal processing circuits and the sensing signal input ends are arranged in a one-to-one correspondence manner, one side of each sensing signal input end is connected with one sensor output end, the other side of each sensing signal input end is connected with the corresponding input end of the signal processing circuit, and the detection end of at least one fault detection circuit is connected with the other side of at least two sensing signal input ends through a single-pole multi-throw switch.

Optionally, the number of the sensing signal input terminals is plural, the number of the signal processing circuit and the number of the fault detection circuit are at least one and less than the number of the sensing signal input terminals, one side of each sensing signal input terminal is connected to one of the sensor output terminals, the input terminal of at least one of the signal processing circuits is connected to the other side of at least two of the sensing signal input terminals through a first single-pole multi-throw switch, and the detection terminal of at least one of the fault detection circuits is connected to the other side of at least two of the sensing signal input terminals through a second single-pole multi-throw switch.

Optionally, the pull-up circuit includes a pull-up resistor and a pull-up switch connected in series, and the pull-down circuit includes a pull-down resistor and a pull-down switch connected in series.

Optionally, the pull-up circuit further comprises an enable control circuit, an input end of the enable control circuit is connected to an output end of the signal processing circuit, and an output end of the enable control circuit is respectively connected to a control end of the pull-up circuit and a control end of the pull-down circuit.

Furthermore, in order to solve the above technical problem, the utility model also provides an electronic device, including foretell sensor detection circuit.

Optionally, the electronic device is a mobile terminal, a wearable device, a household appliance, an electronic scale, an electronic cigarette, an intelligent toilet, or an earphone.

The utility model provides a sensor detection circuitry and electronic equipment, its sensor detection circuitry includes signal processing circuit, fault detection circuit and sensing signal input, sensing signal input connects signal processing circuit's input and fault detection circuit's sense terminal simultaneously, sensing signal input still is used for connecting at least one sensor output, fault detection circuit includes pull-up circuit and drop-down circuit, pull-up circuit establishes ties between sense terminal and first reference voltage input, drop-down circuit establishes ties between sense terminal and second reference voltage input. Therefore, the signal processing circuit can judge whether the connection in the sensor is good or not according to the voltage change of the output end of the sensor under the on-off state of the pull-up circuit and the pull-down circuit in the fault detection circuit, and further realize the fault detection after the sensor is assembled into a module or a complete machine.

Drawings

Fig. 1 is a schematic structural diagram of a sensor detection circuit provided by an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of another sensor detection circuit provided in an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of another sensor detection circuit according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of another sensor detection circuit according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of another sensor detection circuit according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of another sensor detection circuit according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of another sensor detection circuit according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of another sensor detection circuit according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is provided for further details. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for the convenience of description of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

It should be noted that the terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In one embodiment, as shown in fig. 1, the embodiment of the present invention provides a sensor detection circuit 100, the sensor detection circuit 100 includes a signal processing circuit 110, a fault detection circuit 120 and a sensing signal input terminal 130, the sensing signal input terminal 130 connects an input terminal of the signal processing circuit 120 and a detection terminal 123 of the fault detection circuit 120 at the same time, the sensing signal input terminal 130 is further used for connecting at least one sensor output terminal 200, the fault detection circuit 120 includes a pull-up circuit 121 and a pull-down circuit 122, the pull-up circuit 121 is connected in series between the detection terminal 123 and a first reference voltage input terminal REF1, and the pull-down circuit 121 is connected in series between the detection terminal 123 and a second reference voltage input terminal REF 2.

In the present embodiment, the first reference voltage input terminal REF1 and the second reference voltage input terminal REF2 are a preset positive reference voltage input terminal and a preset negative reference voltage input terminal, respectively. The sensor is composed of at least one pair of pull-up sensing resistor and pull-down sensing resistor, each pair of pull-up sensing resistor and pull-down sensing resistor are connected to form a Wheatstone half-bridge, and the connection node of the pull-up sensing resistor and the pull-down sensing resistor is the output end of the Wheatstone half-bridge and is also the sensor output end 200. When the sensor includes a plurality of wheatstone half-bridges, every two wheatstone half-bridges may be connected in parallel to form a wheatstone full-bridge, and the sensor has a plurality of sensor output terminals 200. The sensor signal inputs 130 may be alternately connected to the plurality of sensor outputs simultaneously or in a time-sharing manner. When a sensor output 200 is connected to the sensing signal input 130 of the sensor detection circuit 100, the signal processing circuit 110 of the sensor detection circuit 100 can determine whether the connection in the sensor is good or bad according to the voltage change detected by the input of the signal processing circuit 110 in the on-off state of the pull-up circuit 121 and the pull-down circuit 122 in the fault detection circuit 120, so as to realize fault detection after the sensor is assembled into a module or a complete machine. Specifically, the pull-up circuit 121 and the pull-down circuit 122 in the failure detection circuit 120 are controlled to switch between the following 3 states: in the state a, the pull-up circuit 121 is connected, and the pull-down circuit 122 is disconnected; in the state b, the pull-up circuit 121 is disconnected, and the pull-down circuit 122 is connected; in the state c, the pull-up circuit 121 is turned off and the pull-down circuit 122 is turned off. Taking the first reference voltage input terminal REF1 for inputting the positive reference voltage, the second reference voltage input terminal REF2 for inputting the negative reference voltage, and ground as an example, if the pull-up sensing resistor and the pull-down sensing resistor in a wheatstone half bridge in the sensor are both off, when the fault detection circuit 120 is in the state a, since the input terminal of the signal processing circuit 120 is connected to the positive reference voltage through the pull-up circuit 121, the voltage value detected by the signal processing circuit 120 is higher, which is called the "full-scale voltage value"; when the fault detection circuit 120 is in the state b, since the input terminal of the signal processing circuit 120 is grounded through the pull-down circuit 122, the voltage value detected by the signal processing circuit 120 is 0; when the fault detection circuit 120 is in state c, the signal cannot be detected because the input of the signal processing circuit 120 is floating.

By analogy, whether the pull-up sensing resistor and the pull-down sensing resistor in the sensor are open or short-circuited can be determined according to the voltage signal change detected by the input end of the signal processing circuit 110 in each state, so that the fault detection of the sensor is realized.

For ease of understanding, the correspondence between the voltage signal detected by the signal processing circuit 110 and the various states of the fault detection circuit and the various sense resistor states within the sensor are summarized as the following table. Wherein "intermediate voltage value" refers to a value intermediate between the full scale voltage value and the zero voltage value. "the intermediate voltage value becomes larger (a 1)" means that the detected voltage value is between the intermediate voltage value and the full-scale voltage value. "the intermediate voltage value becomes small (b 1)" means that the detected voltage value is between the intermediate voltage value and the zero voltage value. "the change in the code value in the relatively floating state is significantly reduced from the change in the code value in the (a1) state" means that the magnitude of the change in the detected voltage value is significantly smaller than the magnitude of the change in the voltage in the floating state and the (a1) state. The internal resistance of the pull-up/pull-down circuit path is equivalent to that of the pull-up/pull-down sensor, but is obviously larger than that of the sensor in short circuit, so that when the pull-up circuit is opened, the internal resistance of the pull-up circuit is respectively connected with the short-circuit sensing resistors in parallel, and because the internal resistance of the pull-up circuit path is obviously larger than that of the short-circuit sensing resistors of the sensor, the variation amplitude of the divided voltage generated when the pull-up sensor resistor and the pull-down sensor resistor are simultaneously short-circuited is smaller. "the change in the code value in the floating state is significantly reduced from the change in the code value in the (b1) state" means that the magnitude of the change in the detected voltage value is significantly smaller than the magnitude of the change in the voltage in the floating state. The internal resistance of the pull-up/down circuit path is comparable to the pull-up/down sensor resistance, but significantly greater than the resistance of the sensor when it is shorted. Therefore, when the pull-down circuit is opened, the internal resistance of the pull-down circuit is respectively connected with the short-circuit resistors in parallel, and the internal resistance of the pull-down circuit path is obviously larger than the short-circuit internal resistance of the sensor, so that the variation amplitude of the divided voltage generated when the pull-up sensor resistor and the pull-down sensor resistor are simultaneously short-circuited is smaller. By "non-0 and full scale voltage values" is meant that the simultaneous shorting of the pull-up and pull-down sensors is actually a division of the two smaller shorting resistors, so that the voltage value detected at this time is neither 0 nor the full scale voltage value. When the pull-up sensing resistor and the pull-down sensing resistor in the sensor are short-circuited at the same time, the voltage variation generated by switching from the state c to the state a/state b is obviously smaller than that generated by switching from the state c to the state a/state b in the normal state.

Watch 1

In one embodiment, as shown in fig. 2, the pull-up circuit 121 includes a pull-up resistor R1 and a pull-up switch SW1 connected in series, and the pull-down circuit 122 includes a pull-down resistor R2 and a pull-down switch SW2 connected in series. The on-off state of the pull-up resistor R1 can be controlled by the pull-up switch SW1, thereby realizing the on-off control of the pull-up circuit 121. By pulling down the switch SW2, the on/off state of the pull-down resistor R2 can be controlled, thereby realizing the on/off control of the pull-down circuit 122. Optionally, the sequence of the pull-up resistor R1 and the pull-up switch SW1 connected in series between the detection terminal 123 and the first reference voltage input terminal REF1 may be adjusted arbitrarily according to actual needs, that is, the sequence may be the sequence of the first reference voltage input terminal REF1, the pull-up switch SW1, the pull-up resistor R1 and the detection terminal 123 in the figure, or the sequence may be the sequence of the first reference voltage input terminal REF1, the pull-up resistor R1, the pull-up switch SW1 and the detection terminal 123.

In one embodiment, as shown in fig. 3, the number of the sensing signal input terminals 130 is at least two (specifically, two are taken as an example), one side of each sensing signal input terminal 130 is connected to a sensor output terminal 200, and a connection point between the detection terminal 123 of the fault detection circuit 120 and the input terminal of the signal processing circuit 110 is connected to the other side of each sensing signal input terminal 130 through a single-pole multi-throw switch (illustrated as a single-pole double-throw switch SW 3). At this time, the sensor detection circuit 100 can be connected to at least two sensor output terminals 200 at the same time, but only one of the sensor output terminals 200 can detect a fault at the same time, and the switching of the single-pole multi-throw switch alternately detects a fault in the sense resistors connected to different sensor output terminals 200 at different times. When the connection point of the detection terminal 123 of the fault detection circuit 120 and the input terminal of the signal processing circuit 110 is connected with the sensor output terminal 200 that needs to perform fault detection at present, the signal processing circuit 110 of the sensor detection circuit 100 can determine whether the connection in the sensor is good or bad according to the voltage change detected by the input terminal of the signal processing circuit 110 in the on-off state of the pull-up circuit 121 and the pull-down circuit 122 in the fault detection circuit 120, thereby realizing fault detection after the sensor is assembled into a module or a complete machine.

In an embodiment, as shown in fig. 4, the number of the signal processing circuits 110, the number of the failure detection circuits 120, and the number of the sensing signal input terminals 130 are respectively multiple (N is specifically taken as an example, N is a positive integer greater than or equal to 2), the multiple signal processing circuits 110, the multiple failure detection circuits 120, and the multiple sensing signal input terminals 130 are arranged in a one-to-one correspondence manner, one side of each sensing signal input terminal 130 is connected to a sensor output terminal 200, and the other side of each sensing signal input terminal 130 is respectively connected to the detection terminal 123 of the corresponding failure detection circuit 120 and the input terminal of the corresponding signal processing circuit 110. In this case, the sensor detection circuit 100 can simultaneously access the plurality of sensor outputs 200, and can detect a failure of the plurality of sensor outputs 200 at the same time. That is, each signal processing circuit 110 of the sensor detection circuit 100 can determine whether the connection in the sensor is good or bad according to the voltage change detected by the input terminal of the signal processing circuit 110 in the on-off state of the pull-up circuit 121 and the pull-down circuit 122 in the corresponding fault detection circuit 120, thereby realizing fault detection after the sensor is assembled into a module or a complete machine.

In one embodiment, as shown in fig. 5, the number of the fault detection circuits 120 and the number of the sensing signal input terminals 130 are respectively multiple (specifically, N is an example, N is a positive integer greater than or equal to 2), the number of the signal processing circuits 110 is at least one and less than the number of the sensing signal input terminals 130 (specifically, M is an example, M is a positive integer less than N), the fault detection circuits 120 and the sensing signal input terminals 130 are arranged in a one-to-one correspondence, one side of each sensing signal input terminal 130 is connected to a sensor output terminal 200, the other side of each sensing signal input terminal 130 is connected to a detection terminal 123 of the corresponding fault detection circuit 120, and the input terminal of at least one signal processing circuit 110 is connected to the other side of at least two sensing signal input terminals 130 through a single-pole multi-throw switch (specifically, a single-pole double-throw switch SW 3). At this time, the sensor detection circuit 100 can simultaneously access a plurality of sensor output terminals 200, but since the number of the signal processing circuits 110 is at least one and less than the number of the sensor signal input terminals 130, the plurality of sensor output terminals 200 accessed by a part of the sensor signal input terminals 130 can only perform fault detection on one of the sensor output terminals 200 at the same time, that is, the fault detection is performed on the sensing resistors connected to different sensor output terminals 200 alternately in a time-sharing manner by switching the single-pole multi-throw switch. When the connection point of the detection terminal 123 of the fault detection circuit 120 and the input terminal of the signal processing circuit 110 is connected with the sensor output terminal 200 that needs to perform fault detection at present, the signal processing circuit 110 of the sensor detection circuit 100 can determine whether the connection in the sensor is good or bad according to the voltage change detected by the input terminal of the signal processing circuit 110 in the on-off state of the pull-up circuit 121 and the pull-down circuit 122 in the fault detection circuit 120, thereby realizing fault detection after the sensor is assembled into a module or a complete machine.

In one embodiment, as shown in fig. 6, the number of the signal processing circuits 110 and the number of the sensing signal input terminals 130 are respectively multiple (specifically, N is an example, N is a positive integer greater than or equal to 2), the number of the fault detection circuits 120 is at least one and less than the number of the sensing signal input terminals 130 (specifically, M is an example, M is a positive integer less than N), the signal processing circuits 110 and the sensing signal input terminals 130 are arranged in a one-to-one correspondence, one side of each sensing signal input terminal 130 is connected to a sensor output terminal 200, the other side of each sensing signal input terminal 130 is connected to an input terminal of the corresponding signal processing circuit 110, and the detection terminal 123 of at least one fault detection circuit 120 is connected to the other side of at least two sensing signal input terminals 130 through a single-pole multi-throw switch (specifically, a single-pole double-throw switch SW 3). In this case, the sensor detection circuit 100 can simultaneously access a plurality of sensor outputs 200, but since the number of the fault detection circuits 120 is at least one and less than the number of the sensing signal inputs 130, so that the plurality of sensor outputs 200 connected to the corresponding part of the sensing signal input 130 can only detect the fault of one sensor output 200 at the same time, that is, when the connection point of the detection terminal of the fault detection circuit 120 and the input terminal of the signal processing circuit 110 and the sensor output terminal 200 that needs to perform fault detection at present are connected together by the single-pole multi-throw switch switching, the signal processing circuit 110 of the sensor detection circuit 100 can determine whether the connection in the sensor is good or bad according to the voltage change detected by the input terminal of the signal processing circuit 110 in the on-off state of the pull-up circuit 121 and the pull-down circuit 122 in the fault detection circuit 120, so as to realize fault detection after the sensor is assembled into a module or a complete machine.

In one embodiment, as shown in fig. 7, the number of the sensing signal input terminals 130 is plural (specifically, N is a positive integer greater than or equal to 2 in the figure), the number of the signal processing circuits 110 and the number of the fault detection circuits 120 are at least one and less than the number of the sensing signal input terminals 130 (specifically, M is the number of the signal processing circuits 110 in the figure, L is the number of the fault detection circuits 120 in the figure, M, L are positive integers less than N, and M may be equal to or different from L), one side of each sensing signal input terminal 130 is connected to a sensor output terminal 200, the input terminal of at least one signal processing circuit 110 is connected to the other side of at least two sensing signal input terminals 130 through a first single-pole multi-throw switch (specifically, a single-pole double-throw switch SW4 in the figure), and the detection terminal of at least one fault detection circuit 120 is connected to at least two sensing signal input terminals SW5 through a second single-pole multi-throw switch (specifically, a single-pole double-throw switch SW5 in the figure) 130 on the other side. At this time, the sensor detection circuit 100 can simultaneously access a plurality of sensor output terminals 200, but since the number of the signal processing circuit 110 and the number of the fault detection circuit 120 are respectively at least one and less than the number of the sensor signal input terminals 130, so that a plurality of sensor output terminals 200 accessed by a part of the sensor signal input terminals 130 can only perform fault detection of one of the sensor output terminals 200 at the same time, that is, when the connection point of the detection terminal 123 of the fault detection circuit 120 and the input terminal of the signal processing circuit 110 and the sensor output terminal 200 currently required to perform fault detection are connected together by switching the first single-pole multi-throw switch and the second single-pole multi-throw switch, the signal processing circuit 110 of the sensor detection circuit 100 can determine whether the connection in the sensor is good or bad according to the voltage variation detected by the input terminal of the signal processing circuit 110 in the on-off state of the pull-up circuit 121 and the pull-down circuit 122 in the fault detection circuit 120, and then realize the fault detection after the sensor assembles module or complete machine.

In one embodiment, as shown in fig. 8, the sensor detecting circuit 100 further includes an enable control circuit 140, an input terminal of the enable control circuit 140 is connected to an output terminal of the signal processing circuit 110, and an output terminal of the enable control circuit 140 is respectively connected to a control terminal of the pull-up circuit 121 (e.g., the pull-up switch SW1) and a control terminal of the pull-down circuit 122 (e.g., the pull-down switch SW 2). At this time, the input terminal of the enable control circuit 140 can respectively control the on/off of the pull-up circuit 121 and the pull-down circuit 122, i.e., the on/off of the pull-up switch SW1 and the pull-down switch SW2, according to the processing result of the signal processing circuit 110.

In one embodiment, the present invention provides an electronic device, as shown in fig. 9, including a sensor detection circuit 100 as described in any of the above embodiments.

In one embodiment, the electronic device is a mobile terminal, a wearable device, a household appliance, an electronic scale, an electronic cigarette, an intelligent toilet, or an earphone. Among them, the mobile terminal includes but is not limited to: mobile phones, notebook computers, tablet computers, electronic paper book readers, palm computers, POS machines and the like. Wearable devices include, but are not limited to, electronic bracelets, electronic watches, smart clothing, and the like. Automotive electronics include, but are not limited to, vehicle navigation devices, vehicle audio entertainment devices, vehicle instrument display devices, and the like. The household appliances include, but are not limited to, a refrigerator, an electric rice cooker, a washing machine, an air conditioner, an intelligent toilet, etc. Electronic scales include, but are not limited to, kitchen scales, weight scales, body fat scales, and the like.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (10)

1. A sensor detection circuit is characterized by comprising a signal processing circuit, a fault detection circuit and a sensing signal input end, wherein the sensing signal input end is connected with an input end of the signal processing circuit and a detection end of the fault detection circuit at the same time, the sensing signal input end is also used for being connected with at least one sensor output end, the fault detection circuit comprises a pull-up circuit and a pull-down circuit, the pull-up circuit is connected between the detection end and a first reference voltage input end in series, and the pull-down circuit is connected between the detection end and a second reference voltage input end in series.

2. The sensor detection circuit of claim 1, wherein the number of the sensing signal input terminals is at least two, one side of each of the sensing signal input terminals is connected to one of the sensor output terminals, and a connection point of the detection terminal of the fault detection circuit and the input terminal of the signal processing circuit is connected to the other side of each of the sensing signal input terminals through a single-pole multi-throw switch.

3. The sensor detecting circuit according to claim 1, wherein the number of the signal processing circuits, the number of the fault detecting circuits, and the number of the sensing signal input terminals are plural, the plural signal processing circuits, the plural fault detecting circuits, and the plural sensing signal input terminals are arranged in a one-to-one correspondence, one side of each sensing signal input terminal is connected to one of the sensor output terminals, and the other side of each sensing signal input terminal is connected to the detecting terminal of the corresponding fault detecting circuit and the input terminal of the corresponding signal processing circuit.

4. The sensor detecting circuit according to claim 1, wherein the number of the fault detecting circuits and the number of the sensing signal input terminals are respectively plural, the number of the signal processing circuits is at least one and less than the number of the sensing signal input terminals, the plural fault detecting circuits are disposed in one-to-one correspondence with the plural sensing signal input terminals, one side of each sensing signal input terminal is connected to one of the sensor output terminals, the other side of each sensing signal input terminal is connected to the detecting terminal of the corresponding fault detecting circuit, and the input terminal of at least one of the signal processing circuits is connected to the other side of at least two of the sensing signal input terminals through a single-pole multi-throw switch.

5. The sensor detecting circuit according to claim 1, wherein the number of the signal processing circuits and the number of the sensing signal input terminals are plural, the number of the fault detecting circuits is at least one and less than the number of the sensing signal input terminals, the plural signal processing circuits are disposed in one-to-one correspondence with the plural sensing signal input terminals, one side of each sensing signal input terminal is connected to one of the sensor output terminals, the other side of each sensing signal input terminal is connected to the input terminal of the corresponding signal processing circuit, and the detecting terminal of at least one of the fault detecting circuits is connected to the other side of at least two of the sensing signal input terminals through a single-pole multi-throw switch.

6. The sensor detection circuit according to claim 1, wherein the number of the sensing signal input terminals is plural, the number of the signal processing circuit and the number of the fault detection circuit are at least one and less than the number of the sensing signal input terminals, each of the sensing signal input terminals has one side connected to one of the sensor output terminals, at least one of the signal processing circuit has an input terminal connected to the other side of at least two of the sensing signal input terminals through a first single-pole multi-throw switch, and at least one of the fault detection circuit has a detection terminal connected to the other side of at least two of the sensing signal input terminals through a second single-pole multi-throw switch.

7. The sensor detection circuit of any of claims 1-6, wherein the pull-up circuit comprises a pull-up resistor and a pull-up switch connected in series, and wherein the pull-down circuit comprises a pull-down resistor and a pull-down switch connected in series.

8. The sensor detection circuit of claim 1, further comprising an enable control circuit, wherein an input terminal of the enable control circuit is connected to an output terminal of the signal processing circuit, and an output terminal of the enable control circuit is connected to a control terminal of the pull-up circuit and a control terminal of the pull-down circuit, respectively.

9. An electronic device characterized by comprising the sensor detection circuit according to any one of claims 1 to 8.

10. The electronic device of claim 9, wherein the electronic device is a mobile terminal, a wearable device, a household appliance, an electronic scale, an electronic cigarette, a smart toilet, or an earphone.

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